*{
  padding: 0;
  margin: 0;
}
.hidden {
  display: none;
}
.hidden-visibility {
  opacity: 0;
}
.center {
  margin: auto;
  display: block;
}
.center-ab {
  position: absolute;
  margin: auto auto;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}
page{
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;

  .stage-index{
    background: url(../images/stage-bkg-1.png) no-repeat center center/100% auto;
  }
}
